At the start of the roller coaster KE is small because it is not moving. The GPE is zero because it is at the lowest point. In point 1 it has the most GPE because it is at the highest point. In point 1 there is no KE because it has no motion. In point 3 the GPE is increasing because it is moving toward the second highest point. The KE for point 3 is decreasing because it does not have a whole lot of motion. In point 6 the GPE in the car is about to decrease because it is about to go down a hill. In point 6 the KE is increasing because it is about to gain a lot of speed and motion. One of the ways KE and GPE are connected is because when one is increasing the other is decreasing. And vise versa.
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